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huffyuvdec.c
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1 /*
2  * huffyuv decoder
3  *
4  * Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
7  * the algorithm used
8  *
9  * This file is part of FFmpeg.
10  *
11  * FFmpeg is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU Lesser General Public
13  * License as published by the Free Software Foundation; either
14  * version 2.1 of the License, or (at your option) any later version.
15  *
16  * FFmpeg is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  * Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public
22  * License along with FFmpeg; if not, write to the Free Software
23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24  *
25  * yuva, gray, 4:4:4, 4:1:1, 4:1:0 and >8 bit per sample support sponsored by NOA
26  */
27 
28 /**
29  * @file
30  * huffyuv decoder
31  */
32 
33 #define UNCHECKED_BITSTREAM_READER 1
34 
35 #include "avcodec.h"
36 #include "get_bits.h"
37 #include "huffyuv.h"
38 #include "huffyuvdsp.h"
39 #include "thread.h"
40 #include "libavutil/pixdesc.h"
41 
42 #define classic_shift_luma_table_size 42
43 static const unsigned char classic_shift_luma[classic_shift_luma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
44  34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,
45  16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,
46  69,68, 0,
47  0,0,0,0,0,0,0,0,
48 };
49 
50 #define classic_shift_chroma_table_size 59
51 static const unsigned char classic_shift_chroma[classic_shift_chroma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
52  66,36,37,38,39,40,41,75,76,77,110,239,144,81,82,83,84,85,118,183,
53  56,57,88,89,56,89,154,57,58,57,26,141,57,56,58,57,58,57,184,119,
54  214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0,
55  0,0,0,0,0,0,0,0,
56 };
57 
58 static const unsigned char classic_add_luma[256] = {
59  3, 9, 5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,
60  73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,
61  68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,
62  35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,
63  37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,
64  35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,
65  27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,
66  15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,
67  12, 17, 19, 13, 4, 9, 2, 11, 1, 7, 8, 0, 16, 3, 14, 6,
68  12, 10, 5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,
69  18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,
70  28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,
71  28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,
72  62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,
73  54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,
74  46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13, 7, 8,
75 };
76 
77 static const unsigned char classic_add_chroma[256] = {
78  3, 1, 2, 2, 2, 2, 3, 3, 7, 5, 7, 5, 8, 6, 11, 9,
79  7, 13, 11, 10, 9, 8, 7, 5, 9, 7, 6, 4, 7, 5, 8, 7,
80  11, 8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,
81  43, 45, 76, 81, 46, 82, 75, 55, 56,144, 58, 80, 60, 74,147, 63,
82  143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
83  80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,
84  17, 14, 5, 6,100, 54, 47, 50, 51, 53,106,107,108,109,110,111,
85  112,113,114,115, 4,117,118, 92, 94,121,122, 3,124,103, 2, 1,
86  0,129,130,131,120,119,126,125,136,137,138,139,140,141,142,134,
87  135,132,133,104, 64,101, 62, 57,102, 95, 93, 59, 61, 28, 97, 96,
88  52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,
89  19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10, 9, 8, 36,
90  7,128,127,105,123,116, 35, 34, 33,145, 31, 79, 42,146, 78, 26,
91  83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,
92  14, 16, 17, 18, 20, 21, 12, 14, 15, 9, 10, 6, 9, 6, 5, 8,
93  6, 12, 8, 10, 7, 9, 6, 4, 6, 2, 2, 3, 3, 3, 3, 2,
94 };
95 
96 static int read_len_table(uint8_t *dst, GetBitContext *gb, int n)
97 {
98  int i, val, repeat;
99 
100  for (i = 0; i < n;) {
101  repeat = get_bits(gb, 3);
102  val = get_bits(gb, 5);
103  if (repeat == 0)
104  repeat = get_bits(gb, 8);
105  if (i + repeat > n || get_bits_left(gb) < 0) {
106  av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");
107  return -1;
108  }
109  while (repeat--)
110  dst[i++] = val;
111  }
112  return 0;
113 }
114 
115 static int generate_joint_tables(HYuvContext *s)
116 {
117  uint16_t symbols[1 << VLC_BITS];
118  uint16_t bits[1 << VLC_BITS];
119  uint8_t len[1 << VLC_BITS];
120  int ret;
121 
122  if (s->bitstream_bpp < 24 || s->version > 2) {
123  int p, i, y, u;
124  for (p = 0; p < 4; p++) {
125  int p0 = s->version > 2 ? p : 0;
126  for (i = y = 0; y < s->vlc_n; y++) {
127  int len0 = s->len[p0][y];
128  int limit = VLC_BITS - len0;
129  if(limit <= 0 || !len0)
130  continue;
131  if((sign_extend(y, 8) & (s->vlc_n-1)) != y)
132  continue;
133  for (u = 0; u < s->vlc_n; u++) {
134  int len1 = s->len[p][u];
135  if (len1 > limit || !len1)
136  continue;
137  if((sign_extend(u, 8) & (s->vlc_n-1)) != u)
138  continue;
139  av_assert0(i < (1 << VLC_BITS));
140  len[i] = len0 + len1;
141  bits[i] = (s->bits[p0][y] << len1) + s->bits[p][u];
142  symbols[i] = (y << 8) + (u & 0xFF);
143  i++;
144  }
145  }
146  ff_free_vlc(&s->vlc[4 + p]);
147  if ((ret = ff_init_vlc_sparse(&s->vlc[4 + p], VLC_BITS, i, len, 1, 1,
148  bits, 2, 2, symbols, 2, 2, 0)) < 0)
149  return ret;
150  }
151  } else {
152  uint8_t (*map)[4] = (uint8_t(*)[4])s->pix_bgr_map;
153  int i, b, g, r, code;
154  int p0 = s->decorrelate;
155  int p1 = !s->decorrelate;
156  // restrict the range to +/-16 because that's pretty much guaranteed to
157  // cover all the combinations that fit in 11 bits total, and it doesn't
158  // matter if we miss a few rare codes.
159  for (i = 0, g = -16; g < 16; g++) {
160  int len0 = s->len[p0][g & 255];
161  int limit0 = VLC_BITS - len0;
162  if (limit0 < 2 || !len0)
163  continue;
164  for (b = -16; b < 16; b++) {
165  int len1 = s->len[p1][b & 255];
166  int limit1 = limit0 - len1;
167  if (limit1 < 1 || !len1)
168  continue;
169  code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];
170  for (r = -16; r < 16; r++) {
171  int len2 = s->len[2][r & 255];
172  if (len2 > limit1 || !len2)
173  continue;
174  av_assert0(i < (1 << VLC_BITS));
175  len[i] = len0 + len1 + len2;
176  bits[i] = (code << len2) + s->bits[2][r & 255];
177  if (s->decorrelate) {
178  map[i][G] = g;
179  map[i][B] = g + b;
180  map[i][R] = g + r;
181  } else {
182  map[i][B] = g;
183  map[i][G] = b;
184  map[i][R] = r;
185  }
186  i++;
187  }
188  }
189  }
190  ff_free_vlc(&s->vlc[4]);
191  if ((ret = init_vlc(&s->vlc[4], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0)) < 0)
192  return ret;
193  }
194  return 0;
195 }
196 
197 static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
198 {
199  GetBitContext gb;
200  int i;
201  int ret;
202  int count = 3;
203 
204  init_get_bits(&gb, src, length * 8);
205 
206  if (s->version > 2)
207  count = 1 + s->alpha + 2*s->chroma;
208 
209  for (i = 0; i < count; i++) {
210  if (read_len_table(s->len[i], &gb, s->vlc_n) < 0)
211  return -1;
212  if (ff_huffyuv_generate_bits_table(s->bits[i], s->len[i], s->vlc_n) < 0) {
213  return -1;
214  }
215  ff_free_vlc(&s->vlc[i]);
216  if ((ret = init_vlc(&s->vlc[i], VLC_BITS, s->vlc_n, s->len[i], 1, 1,
217  s->bits[i], 4, 4, 0)) < 0)
218  return ret;
219  }
220 
221  if ((ret = generate_joint_tables(s)) < 0)
222  return ret;
223 
224  return (get_bits_count(&gb) + 7) / 8;
225 }
226 
227 static int read_old_huffman_tables(HYuvContext *s)
228 {
229  GetBitContext gb;
230  int i;
231  int ret;
232 
233  init_get_bits(&gb, classic_shift_luma,
234  classic_shift_luma_table_size * 8);
235  if (read_len_table(s->len[0], &gb, 256) < 0)
236  return -1;
237 
238  init_get_bits(&gb, classic_shift_chroma,
239  classic_shift_chroma_table_size * 8);
240  if (read_len_table(s->len[1], &gb, 256) < 0)
241  return -1;
242 
243  for(i=0; i<256; i++) s->bits[0][i] = classic_add_luma [i];
244  for(i=0; i<256; i++) s->bits[1][i] = classic_add_chroma[i];
245 
246  if (s->bitstream_bpp >= 24) {
247  memcpy(s->bits[1], s->bits[0], 256 * sizeof(uint32_t));
248  memcpy(s->len[1] , s->len [0], 256 * sizeof(uint8_t));
249  }
250  memcpy(s->bits[2], s->bits[1], 256 * sizeof(uint32_t));
251  memcpy(s->len[2] , s->len [1], 256 * sizeof(uint8_t));
252 
253  for (i = 0; i < 4; i++) {
254  ff_free_vlc(&s->vlc[i]);
255  if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
256  s->bits[i], 4, 4, 0)) < 0)
257  return ret;
258  }
259 
260  if ((ret = generate_joint_tables(s)) < 0)
261  return ret;
262 
263  return 0;
264 }
265 
266 static av_cold int decode_init(AVCodecContext *avctx)
267 {
268  HYuvContext *s = avctx->priv_data;
269 
270  ff_huffyuvdsp_init(&s->hdsp);
271  memset(s->vlc, 0, 4 * sizeof(VLC));
272 
273  s->interlaced = avctx->height > 288;
274 
275  s->bgr32 = 1;
276 
277  if (avctx->extradata_size) {
278  if ((avctx->bits_per_coded_sample & 7) &&
279  avctx->bits_per_coded_sample != 12)
280  s->version = 1; // do such files exist at all?
281  else if (avctx->extradata_size > 3 && avctx->extradata[3] == 0)
282  s->version = 2;
283  else
284  s->version = 3;
285  } else
286  s->version = 0;
287 
288  s->bps = 8;
289  s->n = 1<<s->bps;
290  s->vlc_n = FFMIN(s->n, MAX_VLC_N);
291  s->chroma = 1;
292  if (s->version >= 2) {
293  int method, interlace;
294 
295  if (avctx->extradata_size < 4)
296  return -1;
297 
298  method = ((uint8_t*)avctx->extradata)[0];
299  s->decorrelate = method & 64 ? 1 : 0;
300  s->predictor = method & 63;
301  if (s->version == 2) {
302  s->bitstream_bpp = ((uint8_t*)avctx->extradata)[1];
303  if (s->bitstream_bpp == 0)
304  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
305  } else {
306  s->bps = (avctx->extradata[1] >> 4) + 1;
307  s->n = 1<<s->bps;
308  s->vlc_n = FFMIN(s->n, MAX_VLC_N);
309  s->chroma_h_shift = avctx->extradata[1] & 3;
310  s->chroma_v_shift = (avctx->extradata[1] >> 2) & 3;
311  s->yuv = !!(((uint8_t*)avctx->extradata)[2] & 1);
312  s->chroma= !!(((uint8_t*)avctx->extradata)[2] & 3);
313  s->alpha = !!(((uint8_t*)avctx->extradata)[2] & 4);
314  }
315  interlace = (((uint8_t*)avctx->extradata)[2] & 0x30) >> 4;
316  s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
317  s->context = ((uint8_t*)avctx->extradata)[2] & 0x40 ? 1 : 0;
318 
319  if ( read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
320  avctx->extradata_size - 4) < 0)
321  return AVERROR_INVALIDDATA;
322  }else{
323  switch (avctx->bits_per_coded_sample & 7) {
324  case 1:
325  s->predictor = LEFT;
326  s->decorrelate = 0;
327  break;
328  case 2:
329  s->predictor = LEFT;
330  s->decorrelate = 1;
331  break;
332  case 3:
333  s->predictor = PLANE;
334  s->decorrelate = avctx->bits_per_coded_sample >= 24;
335  break;
336  case 4:
337  s->predictor = MEDIAN;
338  s->decorrelate = 0;
339  break;
340  default:
341  s->predictor = LEFT; //OLD
342  s->decorrelate = 0;
343  break;
344  }
345  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
346  s->context = 0;
347 
348  if (read_old_huffman_tables(s) < 0)
349  return AVERROR_INVALIDDATA;
350  }
351 
352  if (s->version <= 2) {
353  switch (s->bitstream_bpp) {
354  case 12:
355  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
356  s->yuv = 1;
357  break;
358  case 16:
359  if (s->yuy2) {
360  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
361  } else {
362  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
363  }
364  s->yuv = 1;
365  break;
366  case 24:
367  if (s->bgr32) {
368  avctx->pix_fmt = AV_PIX_FMT_0RGB32;
369  } else {
370  avctx->pix_fmt = AV_PIX_FMT_BGR24;
371  }
372  break;
373  case 32:
374  av_assert0(s->bgr32);
375  avctx->pix_fmt = AV_PIX_FMT_RGB32;
376  s->alpha = 1;
377  break;
378  default:
379  return AVERROR_INVALIDDATA;
380  }
381  av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt,
382  &s->chroma_h_shift,
383  &s->chroma_v_shift);
384  } else {
385  switch ( (s->chroma<<10) | (s->yuv<<9) | (s->alpha<<8) | ((s->bps-1)<<4) | s->chroma_h_shift | (s->chroma_v_shift<<2)) {
386  case 0x070:
387  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
388  break;
389  case 0x0F0:
390  avctx->pix_fmt = AV_PIX_FMT_GRAY16;
391  break;
392  case 0x170:
393  avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
394  break;
395  case 0x470:
396  avctx->pix_fmt = AV_PIX_FMT_GBRP;
397  break;
398  case 0x480:
399  avctx->pix_fmt = AV_PIX_FMT_GBRP9;
400  break;
401  case 0x490:
402  avctx->pix_fmt = AV_PIX_FMT_GBRP10;
403  break;
404  case 0x4B0:
405  avctx->pix_fmt = AV_PIX_FMT_GBRP12;
406  break;
407  case 0x4D0:
408  avctx->pix_fmt = AV_PIX_FMT_GBRP14;
409  break;
410  case 0x4F0:
411  avctx->pix_fmt = AV_PIX_FMT_GBRP16;
412  break;
413  case 0x570:
414  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
415  break;
416  case 0x670:
417  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
418  break;
419  case 0x680:
420  avctx->pix_fmt = AV_PIX_FMT_YUV444P9;
421  break;
422  case 0x690:
423  avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
424  break;
425  case 0x6B0:
426  avctx->pix_fmt = AV_PIX_FMT_YUV444P12;
427  break;
428  case 0x6D0:
429  avctx->pix_fmt = AV_PIX_FMT_YUV444P14;
430  break;
431  case 0x6F0:
432  avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
433  break;
434  case 0x671:
435  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
436  break;
437  case 0x681:
438  avctx->pix_fmt = AV_PIX_FMT_YUV422P9;
439  break;
440  case 0x691:
441  avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
442  break;
443  case 0x6B1:
444  avctx->pix_fmt = AV_PIX_FMT_YUV422P12;
445  break;
446  case 0x6D1:
447  avctx->pix_fmt = AV_PIX_FMT_YUV422P14;
448  break;
449  case 0x6F1:
450  avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
451  break;
452  case 0x672:
453  avctx->pix_fmt = AV_PIX_FMT_YUV411P;
454  break;
455  case 0x674:
456  avctx->pix_fmt = AV_PIX_FMT_YUV440P;
457  break;
458  case 0x675:
459  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
460  break;
461  case 0x685:
462  avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
463  break;
464  case 0x695:
465  avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
466  break;
467  case 0x6B5:
468  avctx->pix_fmt = AV_PIX_FMT_YUV420P12;
469  break;
470  case 0x6D5:
471  avctx->pix_fmt = AV_PIX_FMT_YUV420P14;
472  break;
473  case 0x6F5:
474  avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
475  break;
476  case 0x67A:
477  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
478  break;
479  case 0x770:
480  avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
481  break;
482  case 0x780:
483  avctx->pix_fmt = AV_PIX_FMT_YUVA444P9;
484  break;
485  case 0x790:
486  avctx->pix_fmt = AV_PIX_FMT_YUVA444P10;
487  break;
488  case 0x7F0:
489  avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;
490  break;
491  case 0x771:
492  avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
493  break;
494  case 0x781:
495  avctx->pix_fmt = AV_PIX_FMT_YUVA422P9;
496  break;
497  case 0x791:
498  avctx->pix_fmt = AV_PIX_FMT_YUVA422P10;
499  break;
500  case 0x7F1:
501  avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;
502  break;
503  case 0x775:
504  avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
505  break;
506  case 0x785:
507  avctx->pix_fmt = AV_PIX_FMT_YUVA420P9;
508  break;
509  case 0x795:
510  avctx->pix_fmt = AV_PIX_FMT_YUVA420P10;
511  break;
512  case 0x7F5:
513  avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;
514  break;
515  default:
516  return AVERROR_INVALIDDATA;
517  }
518  }
519 
520  ff_huffyuv_common_init(avctx);
521 
522  if ((avctx->pix_fmt == AV_PIX_FMT_YUV422P || avctx->pix_fmt == AV_PIX_FMT_YUV420P) && avctx->width & 1) {
523  av_log(avctx, AV_LOG_ERROR, "width must be even for this colorspace\n");
524  return AVERROR_INVALIDDATA;
525  }
526  if (s->predictor == MEDIAN && avctx->pix_fmt == AV_PIX_FMT_YUV422P && avctx->width%4) {
527  av_log(avctx, AV_LOG_ERROR, "width must be a multiple of 4 this colorspace and predictor\n");
528  return AVERROR_INVALIDDATA;
529  }
530  if (ff_huffyuv_alloc_temp(s)) {
531  ff_huffyuv_common_end(s);
532  return AVERROR(ENOMEM);
533  }
534 
535  return 0;
536 }
537 
538 static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
539 {
540  HYuvContext *s = avctx->priv_data;
541  int i;
542 
543  if (ff_huffyuv_alloc_temp(s)) {
544  ff_huffyuv_common_end(s);
545  return AVERROR(ENOMEM);
546  }
547 
548  for (i = 0; i < 8; i++)
549  s->vlc[i].table = NULL;
550 
551  if (s->version >= 2) {
552  if (read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
553  avctx->extradata_size) < 0)
554  return AVERROR_INVALIDDATA;
555  } else {
556  if (read_old_huffman_tables(s) < 0)
557  return AVERROR_INVALIDDATA;
558  }
559 
560  return 0;
561 }
562 
563 /** Subset of GET_VLC for use in hand-roller VLC code */
564 #define VLC_INTERN(dst, table, gb, name, bits, max_depth) \
565  code = table[index][0]; \
566  n = table[index][1]; \
567  if (max_depth > 1 && n < 0) { \
568  LAST_SKIP_BITS(name, gb, bits); \
569  UPDATE_CACHE(name, gb); \
570  \
571  nb_bits = -n; \
572  index = SHOW_UBITS(name, gb, nb_bits) + code; \
573  code = table[index][0]; \
574  n = table[index][1]; \
575  if (max_depth > 2 && n < 0) { \
576  LAST_SKIP_BITS(name, gb, nb_bits); \
577  UPDATE_CACHE(name, gb); \
578  \
579  nb_bits = -n; \
580  index = SHOW_UBITS(name, gb, nb_bits) + code; \
581  code = table[index][0]; \
582  n = table[index][1]; \
583  } \
584  } \
585  dst = code; \
586  LAST_SKIP_BITS(name, gb, n)
587 
588 
589 #define GET_VLC_DUAL(dst0, dst1, name, gb, dtable, table1, table2, \
590  bits, max_depth, OP) \
591  do { \
592  unsigned int index = SHOW_UBITS(name, gb, bits); \
593  int code, n = dtable[index][1]; \
594  \
595  if (n<=0) { \
596  int nb_bits; \
597  VLC_INTERN(dst0, table1, gb, name, bits, max_depth); \
598  \
599  UPDATE_CACHE(re, gb); \
600  index = SHOW_UBITS(name, gb, bits); \
601  VLC_INTERN(dst1, table2, gb, name, bits, max_depth); \
602  } else { \
603  code = dtable[index][0]; \
604  OP(dst0, dst1, code); \
605  LAST_SKIP_BITS(name, gb, n); \
606  } \
607  } while (0)
608 
609 #define OP8bits(dst0, dst1, code) dst0 = code>>8; dst1 = code
610 
611 #define READ_2PIX(dst0, dst1, plane1)\
612  UPDATE_CACHE(re, &s->gb); \
613  GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane1].table, \
614  s->vlc[0].table, s->vlc[plane1].table, VLC_BITS, 3, OP8bits)
615 
616 static void decode_422_bitstream(HYuvContext *s, int count)
617 {
618  int i, icount;
619  OPEN_READER(re, &s->gb);
620  count /= 2;
621 
622  icount = get_bits_left(&s->gb) / (32 * 4);
623  if (count >= icount) {
624  for (i = 0; i < icount; i++) {
625  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
626  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
627  }
628  for (; i < count && get_bits_left(&s->gb) > 0; i++) {
629  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
630  if (get_bits_left(&s->gb) <= 0) break;
631  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
632  }
633  for (; i < count; i++)
634  s->temp[0][2 * i ] = s->temp[1][i] =
635  s->temp[0][2 * i + 1] = s->temp[2][i] = 0;
636  } else {
637  for (i = 0; i < count; i++) {
638  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
639  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
640  }
641  }
642  CLOSE_READER(re, &s->gb);
643 }
644 
645 #define READ_2PIX_PLANE(dst0, dst1, plane, OP) \
646  UPDATE_CACHE(re, &s->gb); \
647  GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane].table, \
648  s->vlc[plane].table, s->vlc[plane].table, VLC_BITS, 3, OP)
649 
650 #define OP14bits(dst0, dst1, code) dst0 = code>>8; dst1 = sign_extend(code, 8)
651 
652 /* TODO instead of restarting the read when the code isn't in the first level
653  * of the joint table, jump into the 2nd level of the individual table. */
654 #define READ_2PIX_PLANE16(dst0, dst1, plane){\
655  dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\
656  dst0 += get_bits(&s->gb, 2);\
657  dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\
658  dst1 += get_bits(&s->gb, 2);\
659 }
660 static void decode_plane_bitstream(HYuvContext *s, int count, int plane)
661 {
662  int i;
663 
664  count/=2;
665 
666  if (s->bps <= 8) {
667  OPEN_READER(re, &s->gb);
668  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
669  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
670  READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane, OP8bits);
671  }
672  } else {
673  for(i=0; i<count; i++){
674  READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane, OP8bits);
675  }
676  }
677  CLOSE_READER(re, &s->gb);
678  } else if (s->bps <= 14) {
679  OPEN_READER(re, &s->gb);
680  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
681  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
682  READ_2PIX_PLANE(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane, OP14bits);
683  }
684  } else {
685  for(i=0; i<count; i++){
686  READ_2PIX_PLANE(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane, OP14bits);
687  }
688  }
689  CLOSE_READER(re, &s->gb);
690  } else {
691  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
692  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
693  READ_2PIX_PLANE16(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);
694  }
695  } else {
696  for(i=0; i<count; i++){
697  READ_2PIX_PLANE16(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);
698  }
699  }
700  }
701 }
702 
703 static void decode_gray_bitstream(HYuvContext *s, int count)
704 {
705  int i;
706  OPEN_READER(re, &s->gb);
707  count/=2;
708 
709  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
710  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
711  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
712  }
713  } else {
714  for(i=0; i<count; i++){
715  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
716  }
717  }
718  CLOSE_READER(re, &s->gb);
719 }
720 
721 static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
722  int decorrelate, int alpha)
723 {
724  int i;
725  OPEN_READER(re, &s->gb);
726 
727  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
728  unsigned int index;
729  int code, n;
730 
731  UPDATE_CACHE(re, &s->gb);
732  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
733  n = s->vlc[4].table[index][1];
734 
735  if (n>0) {
736  code = s->vlc[4].table[index][0];
737  *(uint32_t*)&s->temp[0][4 * i] = s->pix_bgr_map[code];
738  LAST_SKIP_BITS(re, &s->gb, n);
739  } else {
740  int nb_bits;
741  if(decorrelate) {
742  VLC_INTERN(s->temp[0][4 * i + G], s->vlc[1].table,
743  &s->gb, re, VLC_BITS, 3);
744 
745  UPDATE_CACHE(re, &s->gb);
746  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
747  VLC_INTERN(code, s->vlc[0].table, &s->gb, re, VLC_BITS, 3);
748  s->temp[0][4 * i + B] = code + s->temp[0][4 * i + G];
749 
750  UPDATE_CACHE(re, &s->gb);
751  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
752  VLC_INTERN(code, s->vlc[2].table, &s->gb, re, VLC_BITS, 3);
753  s->temp[0][4 * i + R] = code + s->temp[0][4 * i + G];
754  } else {
755  VLC_INTERN(s->temp[0][4 * i + B], s->vlc[0].table,
756  &s->gb, re, VLC_BITS, 3);
757 
758  UPDATE_CACHE(re, &s->gb);
759  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
760  VLC_INTERN(s->temp[0][4 * i + G], s->vlc[1].table,
761  &s->gb, re, VLC_BITS, 3);
762 
763  UPDATE_CACHE(re, &s->gb);
764  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
765  VLC_INTERN(s->temp[0][4 * i + R], s->vlc[2].table,
766  &s->gb, re, VLC_BITS, 3);
767  }
768  if (alpha) {
769  UPDATE_CACHE(re, &s->gb);
770  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
771  VLC_INTERN(s->temp[0][4 * i + A], s->vlc[2].table,
772  &s->gb, re, VLC_BITS, 3);
773  } else
774  s->temp[0][4 * i + A] = 0;
775  }
776  }
777  CLOSE_READER(re, &s->gb);
778 }
779 
780 static void decode_bgr_bitstream(HYuvContext *s, int count)
781 {
782  if (s->decorrelate) {
783  if (s->bitstream_bpp==24)
784  decode_bgr_1(s, count, 1, 0);
785  else
786  decode_bgr_1(s, count, 1, 1);
787  } else {
788  if (s->bitstream_bpp==24)
789  decode_bgr_1(s, count, 0, 0);
790  else
791  decode_bgr_1(s, count, 0, 1);
792  }
793 }
794 
795 static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
796 {
797  int h, cy, i;
798  int offset[AV_NUM_DATA_POINTERS];
799 
800  if (s->avctx->draw_horiz_band==NULL)
801  return;
802 
803  h = y - s->last_slice_end;
804  y -= h;
805 
806  if (s->bitstream_bpp == 12) {
807  cy = y>>1;
808  } else {
809  cy = y;
810  }
811 
812  offset[0] = frame->linesize[0] * y;
813  offset[1] = frame->linesize[1] * cy;
814  offset[2] = frame->linesize[2] * cy;
815  for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
816  offset[i] = 0;
817  emms_c();
818 
819  s->avctx->draw_horiz_band(s->avctx, frame, offset, y, 3, h);
820 
821  s->last_slice_end = y + h;
822 }
823 
824 static int left_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, int w, int acc)
825 {
826  if (s->bps <= 8) {
827  return s->hdsp.add_hfyu_left_pred(dst, src, w, acc);
828  } else {
829  return s->llviddsp.add_hfyu_left_pred_int16(( uint16_t *)dst, (const uint16_t *)src, s->n-1, w, acc);
830  }
831 }
832 
833 static void add_bytes(HYuvContext *s, uint8_t *dst, uint8_t *src, int w)
834 {
835  if (s->bps <= 8) {
836  s->hdsp.add_bytes(dst, src, w);
837  } else {
838  s->llviddsp.add_int16((uint16_t*)dst, (const uint16_t*)src, s->n - 1, w);
839  }
840 }
841 
842 static void add_median_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, const uint8_t *diff, int w, int *left, int *left_top)
843 {
844  if (s->bps <= 8) {
845  s->hdsp.add_hfyu_median_pred(dst, src, diff, w, left, left_top);
846  } else {
847  s->llviddsp.add_hfyu_median_pred_int16((uint16_t *)dst, (const uint16_t *)src, (const uint16_t *)diff, s->n-1, w, left, left_top);
848  }
849 }
850 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
851  AVPacket *avpkt)
852 {
853  const uint8_t *buf = avpkt->data;
854  int buf_size = avpkt->size;
855  HYuvContext *s = avctx->priv_data;
856  const int width = s->width;
857  const int width2 = s->width>>1;
858  const int height = s->height;
859  int fake_ystride, fake_ustride, fake_vstride;
860  ThreadFrame frame = { .f = data };
861  AVFrame * const p = data;
862  int table_size = 0, ret;
863 
864  av_fast_padded_malloc(&s->bitstream_buffer,
865  &s->bitstream_buffer_size,
866  buf_size);
867  if (!s->bitstream_buffer)
868  return AVERROR(ENOMEM);
869 
870  s->bdsp.bswap_buf((uint32_t *) s->bitstream_buffer,
871  (const uint32_t *) buf, buf_size / 4);
872 
873  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
874  return ret;
875 
876  if (s->context) {
877  table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
878  if (table_size < 0)
879  return AVERROR_INVALIDDATA;
880  }
881 
882  if ((unsigned)(buf_size-table_size) >= INT_MAX / 8)
883  return AVERROR_INVALIDDATA;
884 
885  init_get_bits(&s->gb, s->bitstream_buffer+table_size,
886  (buf_size-table_size) * 8);
887 
888  fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
889  fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
890  fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];
891 
892  s->last_slice_end = 0;
893 
894  if (s->version > 2) {
895  int plane;
896  for(plane = 0; plane < 1 + 2*s->chroma + s->alpha; plane++) {
897  int left, lefttop, y;
898  int w = width;
899  int h = height;
900  int fake_stride = fake_ystride;
901 
902  if (s->chroma && (plane == 1 || plane == 2)) {
903  w >>= s->chroma_h_shift;
904  h >>= s->chroma_v_shift;
905  fake_stride = plane == 1 ? fake_ustride : fake_vstride;
906  }
907 
908  switch (s->predictor) {
909  case LEFT:
910  case PLANE:
911  decode_plane_bitstream(s, w, plane);
912  left = left_prediction(s, p->data[plane], s->temp[0], w, 0);
913 
914  for (y = 1; y < h; y++) {
915  uint8_t *dst = p->data[plane] + p->linesize[plane]*y;
916 
917  decode_plane_bitstream(s, w, plane);
918  left = left_prediction(s, dst, s->temp[0], w, left);
919  if (s->predictor == PLANE) {
920  if (y > s->interlaced) {
921  add_bytes(s, dst, dst - fake_stride, w);
922  }
923  }
924  }
925 
926  break;
927  case MEDIAN:
928  decode_plane_bitstream(s, w, plane);
929  left= left_prediction(s, p->data[plane], s->temp[0], w, 0);
930 
931  y = 1;
932 
933  /* second line is left predicted for interlaced case */
934  if (s->interlaced) {
935  decode_plane_bitstream(s, w, plane);
936  left = left_prediction(s, p->data[plane] + p->linesize[plane], s->temp[0], w, left);
937  y++;
938  }
939 
940  lefttop = p->data[plane][0];
941  decode_plane_bitstream(s, w, plane);
942  add_median_prediction(s, p->data[plane] + fake_stride, p->data[plane], s->temp[0], w, &left, &lefttop);
943  y++;
944 
945  for (; y<h; y++) {
946  uint8_t *dst;
947 
948  decode_plane_bitstream(s, w, plane);
949 
950  dst = p->data[plane] + p->linesize[plane] * y;
951 
952  add_median_prediction(s, dst, dst - fake_stride, s->temp[0], w, &left, &lefttop);
953  }
954 
955  break;
956  }
957  }
958  draw_slice(s, p, height);
959  } else if (s->bitstream_bpp < 24) {
960  int y, cy;
961  int lefty, leftu, leftv;
962  int lefttopy, lefttopu, lefttopv;
963 
964  if (s->yuy2) {
965  p->data[0][3] = get_bits(&s->gb, 8);
966  p->data[0][2] = get_bits(&s->gb, 8);
967  p->data[0][1] = get_bits(&s->gb, 8);
968  p->data[0][0] = get_bits(&s->gb, 8);
969 
970  av_log(avctx, AV_LOG_ERROR,
971  "YUY2 output is not implemented yet\n");
972  return AVERROR_PATCHWELCOME;
973  } else {
974 
975  leftv = p->data[2][0] = get_bits(&s->gb, 8);
976  lefty = p->data[0][1] = get_bits(&s->gb, 8);
977  leftu = p->data[1][0] = get_bits(&s->gb, 8);
978  p->data[0][0] = get_bits(&s->gb, 8);
979 
980  switch (s->predictor) {
981  case LEFT:
982  case PLANE:
983  decode_422_bitstream(s, width-2);
984  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0], width - 2, lefty);
985  if (!(s->flags&CODEC_FLAG_GRAY)) {
986  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
987  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
988  }
989 
990  for (cy = y = 1; y < s->height; y++, cy++) {
991  uint8_t *ydst, *udst, *vdst;
992 
993  if (s->bitstream_bpp == 12) {
994  decode_gray_bitstream(s, width);
995 
996  ydst = p->data[0] + p->linesize[0] * y;
997 
998  lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0], width, lefty);
999  if (s->predictor == PLANE) {
1000  if (y > s->interlaced)
1001  s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);
1002  }
1003  y++;
1004  if (y >= s->height) break;
1005  }
1006 
1007  draw_slice(s, p, y);
1008 
1009  ydst = p->data[0] + p->linesize[0]*y;
1010  udst = p->data[1] + p->linesize[1]*cy;
1011  vdst = p->data[2] + p->linesize[2]*cy;
1012 
1013  decode_422_bitstream(s, width);
1014  lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0], width, lefty);
1015  if (!(s->flags & CODEC_FLAG_GRAY)) {
1016  leftu = s->hdsp.add_hfyu_left_pred(udst, s->temp[1], width2, leftu);
1017  leftv = s->hdsp.add_hfyu_left_pred(vdst, s->temp[2], width2, leftv);
1018  }
1019  if (s->predictor == PLANE) {
1020  if (cy > s->interlaced) {
1021  s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);
1022  if (!(s->flags & CODEC_FLAG_GRAY)) {
1023  s->hdsp.add_bytes(udst, udst - fake_ustride, width2);
1024  s->hdsp.add_bytes(vdst, vdst - fake_vstride, width2);
1025  }
1026  }
1027  }
1028  }
1029  draw_slice(s, p, height);
1030 
1031  break;
1032  case MEDIAN:
1033  /* first line except first 2 pixels is left predicted */
1034  decode_422_bitstream(s, width - 2);
1035  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0], width - 2, lefty);
1036  if (!(s->flags & CODEC_FLAG_GRAY)) {
1037  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
1038  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
1039  }
1040 
1041  cy = y = 1;
1042 
1043  /* second line is left predicted for interlaced case */
1044  if (s->interlaced) {
1045  decode_422_bitstream(s, width);
1046  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + p->linesize[0], s->temp[0], width, lefty);
1047  if (!(s->flags & CODEC_FLAG_GRAY)) {
1048  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
1049  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
1050  }
1051  y++; cy++;
1052  }
1053 
1054  /* next 4 pixels are left predicted too */
1055  decode_422_bitstream(s, 4);
1056  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + fake_ystride, s->temp[0], 4, lefty);
1057  if (!(s->flags&CODEC_FLAG_GRAY)) {
1058  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
1059  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
1060  }
1061 
1062  /* next line except the first 4 pixels is median predicted */
1063  lefttopy = p->data[0][3];
1064  decode_422_bitstream(s, width - 4);
1065  s->hdsp.add_hfyu_median_pred(p->data[0] + fake_ystride + 4, p->data[0] + 4, s->temp[0], width - 4, &lefty, &lefttopy);
1066  if (!(s->flags&CODEC_FLAG_GRAY)) {
1067  lefttopu = p->data[1][1];
1068  lefttopv = p->data[2][1];
1069  s->hdsp.add_hfyu_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
1070  s->hdsp.add_hfyu_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
1071  }
1072  y++; cy++;
1073 
1074  for (; y<height; y++, cy++) {
1075  uint8_t *ydst, *udst, *vdst;
1076 
1077  if (s->bitstream_bpp == 12) {
1078  while (2 * cy > y) {
1079  decode_gray_bitstream(s, width);
1080  ydst = p->data[0] + p->linesize[0] * y;
1081  s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
1082  y++;
1083  }
1084  if (y >= height) break;
1085  }
1086  draw_slice(s, p, y);
1087 
1088  decode_422_bitstream(s, width);
1089 
1090  ydst = p->data[0] + p->linesize[0] * y;
1091  udst = p->data[1] + p->linesize[1] * cy;
1092  vdst = p->data[2] + p->linesize[2] * cy;
1093 
1094  s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
1095  if (!(s->flags & CODEC_FLAG_GRAY)) {
1096  s->hdsp.add_hfyu_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
1097  s->hdsp.add_hfyu_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
1098  }
1099  }
1100 
1101  draw_slice(s, p, height);
1102  break;
1103  }
1104  }
1105  } else {
1106  int y;
1107  uint8_t left[4];
1108  const int last_line = (height - 1) * p->linesize[0];
1109 
1110  if (s->bitstream_bpp == 32) {
1111  left[A] = p->data[0][last_line+A] = get_bits(&s->gb, 8);
1112  left[R] = p->data[0][last_line+R] = get_bits(&s->gb, 8);
1113  left[G] = p->data[0][last_line+G] = get_bits(&s->gb, 8);
1114  left[B] = p->data[0][last_line+B] = get_bits(&s->gb, 8);
1115  } else {
1116  left[R] = p->data[0][last_line+R] = get_bits(&s->gb, 8);
1117  left[G] = p->data[0][last_line+G] = get_bits(&s->gb, 8);
1118  left[B] = p->data[0][last_line+B] = get_bits(&s->gb, 8);
1119  left[A] = p->data[0][last_line+A] = 255;
1120  skip_bits(&s->gb, 8);
1121  }
1122 
1123  if (s->bgr32) {
1124  switch (s->predictor) {
1125  case LEFT:
1126  case PLANE:
1127  decode_bgr_bitstream(s, width - 1);
1128  s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4, s->temp[0], width - 1, left);
1129 
1130  for (y = s->height - 2; y >= 0; y--) { //Yes it is stored upside down.
1131  decode_bgr_bitstream(s, width);
1132 
1133  s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * y, s->temp[0], width, left);
1134  if (s->predictor == PLANE) {
1135  if (s->bitstream_bpp != 32) left[A] = 0;
1136  if ((y & s->interlaced) == 0 &&
1137  y < s->height - 1 - s->interlaced) {
1138  s->hdsp.add_bytes(p->data[0] + p->linesize[0] * y,
1139  p->data[0] + p->linesize[0] * y +
1140  fake_ystride, fake_ystride);
1141  }
1142  }
1143  }
1144  // just 1 large slice as this is not possible in reverse order
1145  draw_slice(s, p, height);
1146  break;
1147  default:
1148  av_log(avctx, AV_LOG_ERROR,
1149  "prediction type not supported!\n");
1150  }
1151  }else{
1152  av_log(avctx, AV_LOG_ERROR,
1153  "BGR24 output is not implemented yet\n");
1154  return AVERROR_PATCHWELCOME;
1155  }
1156  }
1157  emms_c();
1158 
1159  *got_frame = 1;
1160 
1161  return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;
1162 }
1163 
1164 static av_cold int decode_end(AVCodecContext *avctx)
1165 {
1166  HYuvContext *s = avctx->priv_data;
1167  int i;
1168 
1169  ff_huffyuv_common_end(s);
1170  av_freep(&s->bitstream_buffer);
1171 
1172  for (i = 0; i < 8; i++) {
1173  ff_free_vlc(&s->vlc[i]);
1174  }
1175 
1176  return 0;
1177 }
1178 
1179 AVCodec ff_huffyuv_decoder = {
1180  .name = "huffyuv",
1181  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
1182  .type = AVMEDIA_TYPE_VIDEO,
1183  .id = AV_CODEC_ID_HUFFYUV,
1184  .priv_data_size = sizeof(HYuvContext),
1185  .init = decode_init,
1186  .close = decode_end,
1187  .decode = decode_frame,
1188  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
1189  CODEC_CAP_FRAME_THREADS,
1190  .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
1191 };
1192 
1193 #if CONFIG_FFVHUFF_DECODER
1194 AVCodec ff_ffvhuff_decoder = {
1195  .name = "ffvhuff",
1196  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
1197  .type = AVMEDIA_TYPE_VIDEO,
1198  .id = AV_CODEC_ID_FFVHUFF,
1199  .priv_data_size = sizeof(HYuvContext),
1200  .init = decode_init,
1201  .close = decode_end,
1202  .decode = decode_frame,
1203  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
1204  CODEC_CAP_FRAME_THREADS,
1205  .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
1206 };
1207 #endif
Generated on Sun Jul 20 2014 23:05:49 for FFmpeg by   doxygen 1.8.2